This section is from the book "Dental Medicine. A Manual Of Dental Materia Medica And Therapeutics", by Ferdinand J. S. Gorgas. Also available from Amazon: Dental Medicine.
Arsenical Necrosis of the Alveolar Process is indicated by a dark purple and swollen condition of gum, with offensive purulent discharge from one or more fistulous openings, or from between the gums and the teeth. The gum becomes soft and spongy, very sensitive, bleeds readily, and loses its connection with the necrosed bone beneath.
(See Necrosis of the Jaws.)